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Old 20 August 2006, 11:14   #1
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Diesel Consumption

Hi. we took delivery of our Redbay Expedition in late may 06.

We have kept reciepts of every diesel fill up from new and ran the engine at roughly 2300-2700 revs cruising.

We currently are burning 4 gallons an hour with a yamaha 422

What are other boats getting?
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Old 20 August 2006, 12:46   #2
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What does that work out to at litres per nmile?
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Old 20 August 2006, 15:24   #3
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What does that work out to at litres per nmile?
Oh c'mom Brian...4 galls per hour, roughly equals 18l per hr, hmm, lets say 2300-2700 knots gives what, 22-25kts? so thats somewhere around 0.8-0.9l per mile? Impressive economy I'd say.
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Old 20 August 2006, 15:57   #4
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Well Alan, your assumptions may be correct-but thats what they are, assumptions.
Hmm. Lets see-wish I could cruise at 2700rpm and get 25knots!
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Old 20 August 2006, 16:17   #5
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Quote:
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Well Alan, your assumptions may be correct-but thats what they are, assumptions.
Hmm. Lets see-wish I could cruise at 2700rpm and get 25knots!

We are!!!!
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Old 20 August 2006, 17:53   #6
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Hi there,
I have a Mercruiser 1.7 Turbo Diesel (120HP)
I cruise @ 25knts, 3800RPM (Yes high I know, but the manual states upto 4400RPM WOT is safe)
We burn 25liters on a 26mile trip

So lets just say 1l per mile

Having said that, the boat weighs 1.4tonne dry, I always keep extra fuel on board aswell as supplies and crew, we're talking about 1.7tonne

I'm well pleased, costs less to run than my old Yamaha 75hp!
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Old 21 August 2006, 04:53   #7
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hi craig

we have 2x yamaha 421s on our 11m redbay
we use approx 5galls per hr on each engine
at 2800-3000 rpm and cruise at average 27 kts

we have been in a marina for 3 months and have
noticed a loss of approx 3 kts due to weed build
up (yes we antifouled!)

mike t.
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Old 21 August 2006, 04:58   #8
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Pacific 22, about 2 tonnes, with larger 22" prop.

1 lpm at 22 knots (kids driving)
1.5 lpm at 30 knots.

Pete
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Old 21 August 2006, 05:43   #9
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Quote:
Originally Posted by M.Thornton
hi craig

we have 2x yamaha 421s on our 11m redbay
we use approx 5galls per hr on each engine
at 2800-3000 rpm and cruise at average 27 kts

we have been in a marina for 3 months and have
noticed a loss of approx 3 kts due to weed build
up (yes we antifouled!)

mike t.
Hi Mike,
Time you got that auld diving suit looked out and gave her arse a wee buff!!.
I am burning a little less than you about 4.5 when under 6 on board @ 28Knts (2850 rpm)and about 5.5 when full 14 on board @ 28knts(3000rpm).
Andy
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Old 21 August 2006, 07:04   #10
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Hi Craig,

I have been running the Redbay 8.4 expedition canopy version since March with the ME422, and also recorded all the fuel used. I am using approx 20l an hour cruising between 2800-2900 which gives 27Kn with 4 people.
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